I will have the required set back distances and lots of room for percolation etc. I just really need to know where the actual site boundary should be measured from: the bank on my side or the centre of the ditch.
The set back on planning is what you work to in order to comply with planning.
This relates the position of the house to physical features, not legal boundaries.
These are shown on the:
- 1:1000 scale Site Location OS Map
- 1:500 scale site Layout Plan
You were required to submit these with your planning application.
Unless you're very close to a legal boundary - and it sounds like you aren't - then the position of the legal boundary may be largely irrelevant.
Legal boundaries deal with issues of trespass and rights, proximity of percolation areas to boundaries, etc.
Other issues may be far more important, for example:
- are you prepared to leave an open ditch that could provide harbourage for vermin across the front of your property
- are you prepared to leave a water filled ditch proximate to where children might play
- are you going to cause upstream flooding problems by culverting it
Your architect, engineer and solicitor should be in a good position to answer these questions.
The issue may be whether or not you own the ditch to allow you address these issues.
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.